Here is the full list of all 20 Zen Universe achievements.
Touch all Guide signs
Hold every historical artifact
Find the golden sickle
Ride the two zip lines
Listen to every Tale
Use the map
Teleport to an unreachable spot
Ride the two zip lines 10 times
Light the torch in your hand
Throw a pebble off the cliff
Touch every statue
Complete Zeus’ trial
Reach Pandora’s Box
Prevail in the final challenge
Break every vase on Olympus
Answer 50 different questions in the Trial of Zeus
Answer 100 different questions in the Trial of Zeus
Set every brazier on fire
Run out of lightning
Hit Zeus’ staff after destroying only 1 obsticle